Kitchen cabinets



N. LEvENBr-:RG

KITCHEN CABINETS Dec. 7, 1965 5 Sheets-Sheetl 1 Original Filed Jan.`15.' 1961 N. LEVENBERG KITCHEN GABINETS Dec. 7, 1965 original Filed Jan.13. 1961 3 Sheets-Sheet 2 Dec. 7, 1965 N. LEVENBERG KITCHEN CABINETSoriginal Filed Jan. 1:5, 1961 F7344 Tw Il Ill 5 Sheets-Sheet 3 IIllllll' United States Patent O 3,222,116 KITCHEN CABINETS NatLevenberg, 2 Windsor Place, Lynbrook, N.Y. Original application Jan. 13,1961, Ser. No. 82,435, now Patent No. 3,149,587, dated Sept. 22, 1964.Divided and this application .lune 29, 1964, Ser. No. 386,809

Claims. (Cl. 312-245) This application is a division of my co-pendingapplication, Ser. No. 82,435, filed January 13, 1961, now Pat. No.3,149,587, granted September 22, 1964.

This invention relates generally t-o cabinets and more particularly toimproved kitchen cabinet construction, although these improvements maybe used in other cabinetry as Well.

A large proportion of kitchen cabinets are stored and shipped in a setup condition, necessitating large storage `space and expensivetransportation, thereby curtailing the distribution area. It is,therefore, among the objects of the present invention to provide animproved knockeddown construction resulting in small storage spacerequirements and low cost shipping.

Another object is to provide a construction which is easily set up andinstalled, needing only a screw driver.

Another object of this invention is to provide a lightweight but strongconstruction which reduces cost in a number of ways, including usingsurrounding building surfaces such as walls and ceilings together withlow cost extrusions and panels.

These objects and other incidental ends and advantages will more fullyappear in the progress of this disclosure and be pointed out in theappended claims.

In the drawings, in which similar reference characters designatecorresponding parts throughout the several views:

FIGURE 1 is a perspective view of wall and base cabinets of anembodiment of the invention.

FIGURE 2 is a vertical sectional view.

FIGURE 3 is a fragmentary perspective view Showing hinge and doorconnection and adjacent structure.

FIGURE 4 is a fragmentary horizontal sectional view as seen from theplane 4-4 on FIGURE 1.

FIGURE 4A is a fragmentary perspective view of an upper tenon member.

FIGURE 5 is a fragmentary horizontal sectional View as seen from theplane 5 5 on FIGURE 1.

FIGURE 6 is a fragmentary elevational view of an end panel for a basecabinet partially assembled (6 6 on FIGURE l0).

FIGURE 7 is a fragmentary elevational view, taken from inside a wallcabinet, a rear View seen from the left of FIGURE 8.

FIGURE 8 is a fragmentary vertical sectional view of a wall cabinet.

FIGURE 9 is a reduced fragmentary horizontal section, seen from theplane 9-9 on FIGURE 8.

FIGURE 10 is a fragmentary vertical sectional view of an end panel.

FIGURE ll is a fragmentary vertical elevational view of a rear supportfor a drawer guide in a base cabinet.

FIGURE 12 is a front elevational View as seen from the plane 12-12onFIGURE 1l.

FIGURE 13 is a fragmentary perspective view of a wall cabinet rearvertical support element and shelf support member.

FIGURE 14 is a fragmentary elevational view, taken from inside a basecabinet looking forward, as seen from the plane 14-14 on FIGURE 15.

FIGURE 15 is a fragmentary vertical section of the front portion of abase cabinet.

FIGURE 16 is a vertical section corresponding to FIG- URE 15 but`showing the upper rear portion of a base cabinet.

FIGURE 17 is a fragmentary elevational View seen from the plane 17-17 onFIGURE 16.

In general, the invention contemplates, in some of its major aspects,the eliminati-on of the top and rear walls of the wall cabinets, therear and bottom walls of the base cabinets, and the end walls of bothcabinets where they abut an adjoining room wall. Furthermore, thevertical frame elements of the Wall and base cabinets are suspended orsupported by interlocking vertical elements which are horizontallyadjustable in position so that doors and drawers may be selected to suitthe total horizontal space and the choice of the user. In addition, aminimum of part types, plus certain interchangeability, affords maximumflexibility to accommodate for any installation but with low inventoryrequirements. This novel structure allows selection of exposeddecorative surface panels, too.

Turning to an upper or wall cabinet assembly, generally indicated byreference character 11, this may comprise broadly: intermediate rearvertical support element 14; upper front horizontal support element 16;upper front vertical support element 18; intermediate front horizontalsupport element 20; intermediate front vertical support element 22;lower front horizontal support element 23; top sliding doors 24;intermediate hinged doors 26; top shelf 28; intermediate shelves 30; andend walls 32.

The intermediate rear ver-tical support element 14 (FIGURE 13) ispreferably an extrusion composed, for example, of aluminum or syntheticresin and is generally T-shaped in cross section with a base 34, centralflange 36, edge beads 37, the flange 36 being provided with a verticalrow of holes 38 adapted to receive shelf support members 40. The members40 are generally U-shaped lbut of irregular configuration, `best seen inFIGURE 13,

and including a cross piece 41 with a central crimp 42, legs 43 and feet44. The crimp 42 is engaged by the edge of a hole 38 when the member 40is half passed through and a twisting motion snaps the member 40 intoxed position where the two horizontal L-shaped portions formed by thecross piece 41 and the legs 43 serve to support the rear corners of thehorizontally disposed shelves 30. The shelves 30 may be of a widthsuilicient to extend between opposite central ilanges 36 or biggershelves may be used, notched to pass said flange 36. The top shelf 28 atthe rear thereof rests on the upper ends 45 of the support elements 14,while the lower ends of the elements 14 extend down only far enough tohold the lowest member 40 to support the lowest shelf 40. The base 34 isconnected to the building Wall 47 in any suitable manner, as by cement,masonry nails, screws 15 (FIGURE 4), or the like.

The upper front horizontal support element 16 is preferably a metal orplastic extrusion, the cross sectional configuration of which is bestseen in FIGURE 8. The base 48 is secured to the ceiling 49 by cement 50and screws 51 for which the base 48 is suitably perforated. Dependingfrom the base 48 are a plurality of flanges 52, 53 and 54. 'I'he frontflange 52 serves as a fascia and between it and the middle flange 53 isformed a channel wherein the upper edges of the sliding top doors 24ride. Rear flange 54 includes a horizontally offset pontion 55 whichprovides vertical support for upper connector 56 which is slidably(horizontally) keyedV to the ilanges 53 and 54, but such movement isprevented after assembly because when the parts are straightened to theposition shown in FIGURE 8 a wedginig action takes place. Rearwardtwisting movement is prevented by the head 57 butting against the base48; while forward twisting movement is prevented by the portion of theconnector 56 which contacts the portion 55 and adjacent surfaces and theportion 58 which contacts the lower edge Aof flange 53. It should benoted that the reinforcing portion 63 of connector 56 prevents rearwardbending or collapse of flange portion 55, the direction in which itcould` go in the case of overload, so that vertical support load islimited by ltensile strength of web 64. Forward twisting is alsoprevented by the upper end 59 of element 18 butting the lower edge offlange 52.

The lower portion of connector 56 has a dovetail groove 60, a roundedlower portion 61, and a sloping rear portion 62, and the upper end 59 ofelement 18 is correspondinigly cut out so that element 1S is maintainedvertically against front or rear movement.

The intermediate front horizontal support element is preferably a metalor plastic extrusion, best seen in FIGURE 8. The base 65 has, projectingupward, three flanges 66, 67 and 68, and a downward flange 69. The frontflange 66 and middle flange 67 form a channel for the lower edges ofdoors 24. Rear flange 68 has a horizontal offset portion 70 whichprovides vertical support for lower connector 71, slidably(horizontally) keyed to flanges 67 and 68, but horizontal movement isprevented after assembly by the weight of the parts and contents of Ithecabinet and a wedging takes place when the parts are straightened -tothe position shown in FIGURE 8. Relative rearward twisting movement ofrounded portion 72 is prevented by the head 74 butting against base 65and adjacent surfaces, while relative forward twisting movement ofpor-tion 72 is prevented at offset portion 70 and the upper edge offlange 67.

The upper portion of connector 71 has a dovetail groove 73 and a slopingrear portion 75, and the lower end 76 of element 18 is thus securelyheld in place. Overloading would tend to bend flange 68 rearward but itis supported against this by the head 74.

The upper front vertical support elements 16 are T- shaped in crosssection and preferably identical to the rear ones 14 (FIGURE 13) havingfront bases 77 and central flanges 78, and their height is determined bythe height of sliding doors 24.

The downward flange 69 on element 20 forms the upper margin of thehinged door enclosed portion of the wall cabinets 11 and theintermediate front vertical support elements 22 are suspended therefromby combination connector hinges 80. Where the particular element 22 lieshorizontally between doors 26 at their hinged edges a double unit suchas that shown in FIGURE 3 is utilized, and where only one hinged edge ispresent (as at the end vertical edge of a cabinet) a modified unit,containing only one hinge, is utilized (compare lower portion of FIGURE10) The connector hinge 80 has a body 81, to the upper surface at thefront portion of which are pivotally connected the relatively movableL-shaped hinge members 83 and 84. The relatively free ends of members 83and 84 are in the form of fingers with threaded holes (substantiallyidentical with the members 134 and 183 on FIGURE 3) which are insertedin correspondingly positioned holes in the respective doors 26. At therear edge of the body 81 there are a pair of right-angle bent ears 85and 86 which have pins 87 and 88. The flange 69 and the support elements22 are provided with aligned slots, which are of sutllcient size toallow passage of the ears 85 and 86 therethrough in a curving directionthrough approximately 90 until the pins 87 and 88 may be received bycorrespondingly sized and positioned receptacles S9. There is enoughroom and permissible movement for this operation when the hinge members83 and 84 are not yet engaged by the doors. After such engagement,however, the connector hinges 80 are substantially stationary withrespect to the flange 69 and element 22.

The length of elements 22 is substantially equal to the height of doors26, and at the lower ends 90 of elements 22 are connected to the lowerfront horizontal support 23 (except for the inverted position of thecombination connector hinges a) in a manner like that just described inconnection with the hinges 80. The support 23 is preferably L-shaped insection, and concealed by the closed doors 26, and lies below thelowermost shelf 30. Elements 22 are perforated at 38a to correspond withelements 14, and shelf support members 40 carry the front corners ofshelves 3f).

When the upper wall cabinet lies between two opposed substantiallyparallel building walls, the parts can be sized horizontally so that nocabinet end walls 32 are required. When this is not the case end walls32 are utilized. This structure is shown in FIGURES 1, 4, 4A, 8, 9 and10. The end walls 32 are substantially identical, being leftandright-hand counterparts, the corresponding parts having the samereference characters. End walls 32 have an outer decorative panel 91held in place by edge frame members 92, 93, 94 and 95, of irregularsection, best seen in FIGURE l0, so that, as mitered, a peripheralinwardly opening channel 96 is formed with inner grooved flanges9212-951). Members 92-95 have inwardly directed right angle flanges92a-95a, respectively, which are connected to or associated withadjoining parts. Flange 94a may lie forward of base 34 on element 14 andbe held by screws 15 (FIGURE 4) which would normally hold base 34 inplace. Next frame members 92 and 95 are put into place in vertical planealignment with member 44. The grooves 97 in grooved flanges 94b and 951)line up at right angles with the groove 97 in flange 92h, and the upperright angle tenon members 98 are put into place into said grooves.Altogether there are four tenon members for each end wall 32. The uppertwo (FIGURES 4A and 10) have each leg semicircular in cross section withintegral fixed dowels 99, and the; fit flush into grooves 97, the dowelspenetrating correspondingly positioned holes in said grooves.

Next, the panel 91 is slid into channel 96 in an upward direction and assoon as tenon members 98 are covered they can on longer be removed, sothat the panel 91 locks frame members 92 to members 95 and 94. The lowertwo tenon members 98a have in their horizontal legs permanently secureddowels which engage holes in the groove of flange 93h, but the verticallegs have holes. Now the member 93 is moved vertically up into positionso that its channel 96 engages the remaining edge of panel 91 and thevertical legs of tenon members 98a fit into the grooves in flanges 94hand 95b (FIGURE 4). Finally the pins 101 are passed through the alignedholes in the grooves 97 in flanges 94b and 95h which locks the partstogether. The pins 101 are manipulated inside the cabinet. Now necessarycombination connector hinges 80 and 80a are put into place securingflange a.

Additional support may be given the flange 92a by screws 102, flange 92abeing cut back to allow clearance for the base 48 of element 16. A stop103 may close the end of the channel within which the sliding doors 26are located.

Turning to the base cabinet assembly, generally indicated by referencecharacter 111, this may comprise broadly: a counter top 112; upper rearhorizontal support element 113; lower rear vertical support element 114;upper front horizontal support element 116; front vertical supportelement 122; intermediate front horizontal support element lower fronthorizontal support element 123; drawers 124; hinged doors 126; drawerguides 12S; shelves 130; and end walls 132.

The upper rear horizontal support element 113 is preferably an extrusionextending substantially the full length of the base cabinet. It iscomposed, for example, of aluminum or synthetic resin and is ofirregular configuration, best seen in FIGURE 16. The base 127 may besecured to wall 147 by adhesive cement and screws 115, and has a forwardupper angular lip 117 and a lower lip 119. The lip 119 forms a channelalong which connectors 121 may be placed in selected positions. The lip117 diverges forward from the wall 147 so that even when the wall 147 isnot flat the counter top rear support 110 may be adequately engaged. Theconnectors 121 need not be very wide, for example 11/2 inches, and theyserve to carry upper ends of the elements 114 which are T- shaped incross section.

The elements 114 include a base 134 and a central flange 136. Flange 136is provided with a series of spaced holes 138 to receive shelf supportmembers 140 which are. identical with the members 40 (FIGURE 13), whilebase 134 has edge beads 137 to coact with members 140. Elements 114 atthe lower ends 146 thereof rest on the oor 200, while at the upper endsa portion of central ange 136 is removed and the remaining base 134 isbent to form a hook 145 which engages into connector 121.

Connector 121 is used where a vertical element 114 will be used tosupport the rear corners of shelves 130 by members 140 thereon. In thoselocations along base cabinet 111 where the rear ends of drawer guides125 are supported, structure shown in FIGURES ll and 12 is used. Herethe upper end of the drawer supports 128 are hooked onto the lower lip119 while the forwardly extending horizontal brackets 129 are at thesame level as the element 120.

It is to be noted that the engagement of the connectors 121 and the reardrawer guide supports 128 with the lip 119 affords a high degree offlexibility and adjustment While at the same time providing a rigidstructure. The connectors 121 and supports 128 are put in place with atwisting motion which rst hooks them onto the lip 119 and then when theconnectors 121 and the supports 128 are swung down into a verticalposition they become rigidly self-clamped to a solid connection in whichthey are fixed against movement longitudinally ofthe lip 119.

Since the structure of the upper portions of connectors 121 and supports128 is substantially identical, description of one will describe theother as well.` Connector 121 has a downwardly directed tongue 131 whichhas irst and second opposed protuberances which are vertically offset(FIGURE 16), the lirst or rear protuberance being lower than the secondor` front one. The distance between the crowns of the two protuberances(horizontally front to rear) is slightly greater than the width of thetrough formed between the lip 119 and the base 127. The inner surface ofthe lip 119 adjoining the upper edge thereof is provided with a thirdrearwardly extending protuberance. When canted as shown in the dot-dashlines on FIGURE l6,the effective transverse distance between first andsecond protuberances is substantially equal to the width of said troughat its narrowest part (at the level of the third protuberance). Thisallows the connector 121 to be slidably lowered into said trough. Whenthe connector lis moved to its vertical position, a wedging actionoccurs in the trough so that sliding along the horizontal element 113 isprevented. Furthermore, any tendency of the connector 121 to rise isprevented by the third protuberance which is on the inner surface of lip119. As seen in FIG. 16, hook 145 is angularly insertable into connector121 (dot-dash lines) but is retained (full lines) because rearwardmovement past vertical of element 114 is prevented by wall 147.

The upper front horizontal support element 116 is preferably anextrusion and includes a at top ilange 148 which is secured to the undersurface of the counter top 112 by cement or screws 151. The front flange152 is disposed at the exact distance from wall 147 to determine thedepth of the base cabinet. The connecting portion 153 is approximately ahalf circle so that the rounded hook 179 formed in the central flange178 of element 122 may first be engaged by rotating the same clockwise(as view in FIGURE 15) about portion 153 and then rotating the hook 179in a counterclockwise direction until the curved lock member 174 isengaged under the portion 152. The upper edge 173 butting against theledge 172 places the element 122 in Vertical position, where it is heldwhen the shelves 130 and drawer guides 125 are put in place.

The elements 122 have bases 177 and central anges 178, the latter beingnotched to receive the elements 120 and 123 which are partially held inposition by clip elements 104 and 105. All of the clip elements areidentical so a detailed description of one will suffice for all. Clipelement 104 is preferably formed of resilient sheet material such asspring steel, aluminum alloy or the like, and comprises a body 111having a pair of openings which align with corresponding openings in thebase 177 and through which the ears 185 and 186 of the combinationconnector hinge 180 pass during assembly. Clip element 104 has a pair ofupper vertical clip members 106 and lower clip members 107 which areadapted to engage, in snap fashion, the outer vertical edges of the base177 and the beads 137. Clip element 104 also has an upper horizontalclip members 108 and lower horizontal clip members 109. The members 108snap on to engage the upper horizontal flange of the element 120 whilemembers 109 snap on to engage the lower vertical flange of the element120. Clip element is put on in an inverted position (see lower portionof FIGURE 15). With the clip elements 104 and 105 in place, theinstallation of the combination connector hinges 180a is a simpleprocedure, substantially identical with that described above withreference to the combination connector hinges 80, the insertion -of pins187 and 188 into aligned holes in the elements 120 and 123 and the base177, and the placing of the doors 126 secures the parts in operatingpositions. The placing of the doors 126 is illustrated in FIGURE 3, thedoors being finally secured by the screws 133 which engage the door andthe threaded holes 135.

In connection with the door and hinge construction, by cutting back thecorners of the doors at the pivoting edges thereof, the hinge membersmay be fully recessed so that said pivoting edges may lie closely nextto each other, thereby concealing the front vertical support elements 22and 122. It may also be noted that by virtue of the constructionillustrated in FIGURE 3, two swingable doors may be hung in hingefashion from a single upright and there need be no cabinet lateral wallsat that area. This gives the user considerable freedom of use because ofno compartmenting, although where desired vertical dividers may besecured between the central flanges on the T-shaped opposed (front andrear) uprights.

The same considerations apply to the base cabinets with regard to theend walls 132, soV that the structure previously described withreference to the end walls 32 is substantially equally applicable,except that the edge frame member 193 is inserted from the front of thebase cabinet. Certain of the parts corresponding to the equivalent upperwall cabinet structure, and illustrated in FIG- URES l, 5 and 6, aregiven the same reference characters with the prex 1.

Installation of the base cabinets is preferably accomplished .by iirstconnecting element 113, and the requisite number and positioning of rearelements 114, to wall 147. Next the requisite guide supports 128 arehooked on. The necessary shelf supports 140 may be connected to elements114. Since the upper rear horizontal support element 113 serves as ahanger bar, it will not normally be necessary to attach the base 134 tothe wall 147.

Next with the bars 120 and 123 in the cabinet area, at least two of theelements 122 are connected to the element 116. Now the counter top rearsupport is hooked onto the element 113. The lower ends of elements 122are rested on the oor 200, and the elements and 123 are put into placeusing the clip elements 104 and 105.

Following this, additional elements 122 are installed as required bycatching the hooks 179 on the portions 153 with the elements 122rearwardly canted and they are swung forward until vertical. Theremaining cross junctures between front upright element 122 andhorizontal elements 120 and 123 may be connected by clip elements 164and 105, or they may be omitted.

Thus, it will be seen that the clip elements 104 and 105 strengthen theinterconnections between the horizontal elements 120 and 123 and thevertical element to which they are attached. Furthermore, they maintainthe respective orifices in alignment so that when the combinationconnector hinges 80 and 180 are put in place, they quickly and easilyslide into the proper position. It is, however, possible to obtain aconnection without the clip elements by temporarily aligning the partsas the elements 180 and 80 are put into position.

With the framework of the base cabinet thus set up, it becomes a matterof choice, in some respects, as to the sequence in which the remainingparts are put in place. For example, the drawer guides 125 may now beengaged at that rear end on the brackets 129. This connection may bemade by a dowel relationship, or a hook and orice, or nut and bolt, oradhesive. The forwardmost portions of the drawer guides 125 may then besuitably connected to the horizontal elements 120 in a similar manner.This structure is illustrated in dot-dash lines at the upper portions ofFIGURES 14 and 15. Following this, the drawers 124 may be put into placeupon the drawer guides 125.

Now the front shelf support members 140 are put in place at the samelevel as the rear ones previously installed, and the shelves 130 may bedropped into place.

While I have shown the work top 112, as plain, it will be obvious thatwhere desired, a sink may be incorporated, or built in cook tops orrange units.

I wish it to be understood that I do not desire to be limited to theexact details of construction shown and described, for obviousmodifications will occur to a person skilled in the art to which thepresent invention relates.

I claim:

1. Cabinet construction comprising:

(a) an upper front horizontal support element having a plurality ofdepending flanges, one of said ilanges having an upwardly facingsurface;

(b) an upper front vertical support element;

(c) an upper connector which has a portion thereof resting on the saidupwardly facing surface of the upper front horizontal support element,has a second portion engaging a front surface of one of said flanges,and a third portion engaging a rear surface of one of said llanges, saidupper connector being adjustably positionable along said upper fronthorizontal support element, said upper connector having a horizontallydisposed groove within which is disposed a portion of the upper frontvertical support element;

(d) and, an intermediate front horizontal support element having aplurality of flanges and a downwardly facing surface;

(e) and a lower connector detachably interconnecting the lower portionof the upper front vertical support element and the intermediate fronthorizontal support element, and engaging said downwardly facing surface.

2. Structure as claimed in claim 1 in which the said upper fronthorizontal support element has a downwardly directed sliding doorreceiving channel, and said intermediate front horizontal supportelement has an upwardly directed sliding door receiving channel.

3. Cabinet construction comprising:

(a) an intermediate rear vertical support element;

(b) an upper front horizontal support element having a plurality ofdepending flanges, one of said flanges having an upwardly facingsurface;

(c) an upper front vertical support element;

(d) an upper connector detachably interconnecting said upper fronthorizontal support element and said upper front vertical supportelement, said upper connector having a first portion thereof resting onthe said upwardly facing surface of the upper front horizontal supportelement, and having a second portion engaging a front surface of one ofsaid flanges, and a third portion engaging a rear surface of one of saidflanges, said upper connector being adjustably positionable along saidupper front horizontal support element, said upper connector having ahorizontally disposed groove within which is disposed the upper portionof the upper front vertical support element;

(e) an intermediate front horizontal support element having a pluralityof flanges and a downwardly facing surface;

(f) a lower connector detachably interconnecting the lower portion ofthe upper front vertical support element and the intermediate fronthorizontal support element, engaging said downwardly facing surface;

(g) an intermediate front vertical support element detachably connectedat its upper end to said intermediate front horizontal support element;

(h) a lower front horizontal support element;

(i) a door movably supported between the upper front horizontal supportelement, and said intermediate element.

4. Structure as claimed in claim 3 having a second door movablysupported between the intermediate front horizontal support element andthe lower front horizontal support element.

5. Structure as claimed in claim 3 including a top shelf which issupported at the rear thereof by resting upon the upper end of theintermediate rear vertical support element and the forward edge thereofby resting upon the upper end of the intermediate front vertical supportelement.

References Cited by the Examiner UNITED STATES PATENTS 669,171 3/1901Jeileris 312-245 X 1,340,562 5/ 1920 Sandmann 312-108 2,158,291 5/1939Lank 312-257X 2,733,887 2/1956 Schmidt 312-245 X 2,999,599 9/ 1961.lentzen 312-245 X FOREIGN PATENTS Ad. 60,309 11/ 1954 France.

FRANK B. SHERRY, Primary Examiner.

CHANCELLOR E. HARRIS, Examiner.

1. CABINET CONSTRUCTION COMPRISING: (A) AN UPPER FRONT HORIZONTALSUPPORT ELEMENT HAVING A PLURALITY OF DEPENDING FLANGES, ONE OF SAIDFLANGES HAVING AN UPWARDLY FACING SURFACE; (B) AN UPPER FRONT VERTICALSUPPORT ELEMENT; (C) AN UPPER CONNECTOR WHICH HAS A PORTION THEREOFRESTING ON THE SAID UPWARDLY FACING SURFACE OF THE UPPER FRONTHORIZONTAL SUPPORT ELEMENT, HAS A SECOND PORTION ENGAGING A FRONTSURFACE OF ONE OF SAID FLANGES, AND A THIRD PORTION ENGAGING A REARSURFACE OF ONE OF SAID FLANGES, SAID UPPER CONNECTOR BEING ADJUSTABLYPOSITIONABLE ALONG SAID UPPER FRONT HORIZONTAL SUPPORT ELEMENT, SAIDUPPER CONNECTOR HAVING A HORIZONTALLY DISPOSED GROOVE WITHIN WHICH ISDISPOSED A PORTION OF THE UPPER FRONT VERTICAL SUPPORT ELEMENT; (D) AND,AN INTERMEDIATE FRONT HORIZONTAL SUPPORT ELEMENT HAVING A PLURALITY OFFLANGES AND A DOWNWARDLY FACING SURFACE; (E) AND A LOWER CONNECTORDETACHABLY INTERCONNECTING THE LOWER PORTION OF THE UPPER FRONT VERTICALSUPPORT ELEMENT AND THE INTERMEDIATE FRONT HORIZONTAL SUPPORT ELEMENT,AND ENGAGING SAID DOWNWARDLY FACING SURFACE.